Does the Webasto heat the battery?

[hifi239]

When I plug into a DC charger without preconditioning is it the Webasto that takes the battery from 70 to 90F in 20 minutes?

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[anonymouse]

I have no idea what a Webasto is, but batteries always warm naturally during charging

 

[hifi239]

I have no idea what a Webasto is, but batteries always warm naturally during charging

The Webasto is the 10,000-watt heater that has had a spate of failures in Taycans. This results in no heat. But that's my question, does that also mean no battery preconditioning and no heating during charging? Actually my battery will go from 60F to 90F in less than 20 minutes on a DCFC. I'm not convinced that's only due to the battery resistance heating, but maybe.

 

[f1eng]

I believe rapid charging heats the battery quite quickly. The cooling may even cut in after a while to stop the battery getting too hot.

I do suspect the webasto heater does heat the battery as well as cabin if you select pre-heat and if a timer is set using normal AC charging.

 

[McgR]

During last years heater failure epidemic I saw several post of owners not being able to precondition the battery when the heater was broken. DC charging therefore was very slow. So I presume the HV heater / Webasto also pre heats the battery. Apperntly DC charging it self didn’t generate enough heat to increase charging speed in those cases last year.

 

[Tooney]

Page 203 of the audi e-tron training overview shows that the Webasto HV heater (Z189) is involved in heating the HV battery. Not clear when "heating the HV battery" condition is activated.

Pages 206 and 207 show cooling can be active during DC charging, but no mention of heating during DC charging.

 

[hifi239]

Makes sense. Thank you!

 

[lcarron]

Then is this electric heater only for the battery or the cabin as well? I'm a bit confused about what the heat pump is doing. Is it in addition?
Any information will be super helpful.

 

[McgR]

Then is this electric heater only for the battery or the cabin as well? I'm a bit confused about what the heat pump is doing. Is it in addition?
Any information will be super helpful.

The Webasto is a HV heater for the cabin and battery. The heat pump is something else. It is a option and increases range in cold weather.

 

[whitex]

Not clear when "heating the HV battery" condition is activated.

It is activated when the battery temperature falls below 50F while charging, higher level of heating kicks in at -22F.

 

[whitex]

Then is this electric heater only for the battery or the cabin as well? I'm a bit confused about what the heat pump is doing. Is it in addition?
Any information will be super helpful.

Heat pump allows the Taycan to move/recycle heat more efficiently between components. It consists of few extra valves - see top left "Heat Pump shut-off valves" in the diagram below. For example, it makes your Taycan more efficient by reusing the heat in the winter, rather than radiating it out and then running the heater for more heat.

 

[bsclywilly]

Heat pump allows the Taycan to move/recycle heat more efficiently between components. It consists of few extra valves - see top left "Heat Pump shut-off valves" in the diagram below. For example, it makes your Taycan more efficient by reusing the heat in the winter, rather than radiating it out and then running the heater for more heat.

Never ceases to amaze me how much technical information is out there for our car. Here’s a picture of the coolant manifold if anyone wants to match the diagram to the physical parts.

 

[hifi239]

thanks for this!
A couple of questions:
- what does the profile for launch control mean? Launch control, at least mine, is active for only a few seconds, no? Do some Taycans have an always on launch control?
- what does the profile for DCFC mean? Is that the preconditioning profile? I don’t think so. I think it means that when you are on DCFC, the Webasto will augment the battery resistance heating below 50F to help the battery get hot faster?

 

[simcity]

Heat pump allows the Taycan to move/recycle heat more efficiently between components. It consists of few extra valves - see top left "Heat Pump shut-off valves" in the diagram below. For example, it makes your Taycan more efficient by reusing the heat in the winter, rather than radiating it out and then running the heater for more heat.

That looks like a US publication - can you confirm what it is? Thanks

[I've got a PDF of the Audi e-tron GT's SSP 684]

 

[simcity]

thanks for this!
A couple of questions:
- what does the profile for launch control mean? Launch control, at least mine, is active for only a few seconds, no? Do some Taycans have an always on launch control?
- what does the profile for DCFC mean? Is that the preconditioning profile? I don’t think so. I think it means that when you are on DCFC, the Webasto will augment the battery resistance heating below 50F to help the battery get hot faster?

DCFC = DC Fast Charging - Either pre-con (en route) or during the actual fast charging session - battery is heated up to around 34-36C (whatever that is in Fahrenheit) before full DC power is allowed to be unleashed.

Launch control isn't "always on" for any Taycan variant. The battery needs to be 'goldilocks' warm to discharge effectively at high rates as well as recharge at high rates. It's just the way it is with lithium chemistry.

Back in the early days of fitting my bikes with lithium starter batteries, in really cold weather, you would expect a good few cranks before the battery was warm enough to deliver full juice. What the Taycan is doing with a heating circuit on the coolant is just another way of getting the battery warm, rather than relying on pure current flow through the pack to do the job.

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